But now that I've given notice that I'm switching this month, the old PM is outright refusing to send the ex-tenants to collections as they are "no longer under contract, our partnership is considered terminated and we are not able to represent you in any way."

Unfortunately they're saying my contracts the contract, but I am getting a little concerned that I just lost $20k. 

Who pays for maintenance is determined by the written contract between parties, not a list on the internet.

Same thing on their side, they should have had this written in the contract.

I've considered a short sale, but am under contract, I think, with a buyer already due to the commitment to sell document I signed...

Quote from @Angel Peng: Currently in contract to close on my first duplex but the Landlord insurance cost took me by surprise.

FYI Transunion Smart Move has the same processes as RentSpree.

I've just put my fifth rental property under contract and I'm really starting to hate manually dealing with bookkeeping in Stessa every month.

It is the IRS rules around short term rentals.Loophole - A way of avoiding or escaping a cost or legal burden that would otherwise apply by means of an omission or ambiguity in the wording of a contract or law.

Generally speaking, on the west coast,  tenant protections increase on month-month contracts.